/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Apache" and "Apache Software Foundation" and
 *    "Apache Lucene" must not be used to endorse or promote products
 *    derived from this software without prior written permission. For
 *    written permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    "Apache Lucene", nor may "Apache" appear in their name, without
 *    prior written permission of the Apache Software Foundation.
 *
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

using System;

using DotnetPark.NLucene.Util; 

namespace DotnetPark.NLucene.Index
{
	internal class SegmentMergeInfo 
	{
		Term term;
		int bs;
		SegmentTermEnum termEnum;
		SegmentReader reader;
		SegmentTermPositions postings;
		int[] docMap = null;				  // maps around deleted docs

		internal SegmentMergeInfo(int b, SegmentTermEnum te, SegmentReader r) 
		{
			bs = b;
			reader = r;
			termEnum = te;
			term = te.Term();
			postings = new SegmentTermPositions(r);

			if (reader.DeletedDocs != null) 
			{
				// build array which maps document numbers around deletions 
				BitVector deletedDocs = reader.DeletedDocs;
				int maxDoc = reader.MaxDoc();
				docMap = new int[maxDoc];
				int j = 0;
				for (int i = 0; i < maxDoc; i++) 
				{
					if (deletedDocs.Get(i))
						docMap[i] = -1;
					else
						docMap[i] = j++;
				}
			}
		}

		internal bool Next() 
		{
			if (termEnum.Next()) 
			{
				term = termEnum.Term();
				return true;
			} 
			else 
			{
				term = null;
				return false;
			}
		}

		internal void Close() 
		{
			termEnum.Close();
			postings.Close();
		}

		internal Term Term
		{
			get
			{
				return term;
			}
			set
			{
				term = value;
			}
		}
		internal int Base
		{
			get
			{
				return bs;
			}
			set
			{
				bs = value;
			}
		}
		internal SegmentTermPositions Postings
		{
			get
			{
				return postings;
			}
			set
			{
				postings = value;
			}
		}

		internal int[] DocMap
		{
			get
			{
				return docMap;
			}
			set
			{
				docMap = value;
			}
		}

		internal SegmentTermEnum TermEnum
		{
			get
			{
				return termEnum;
			}
			set
			{
				termEnum = value;
			}
		}
	}
}
